| Question |
Answer |
| a sheath of areolar connective tissue that wraps around individual skeletal muscle fibers |
endomysium |
| dense irregular connective tissue that separates a muscle into groups of individual muscle fibers |
perimysium |
| bundles of muscle fibers |
fascicles |
| the outermost connective tissue layer that encircles an entire skeletal muscle |
epimysium |
| dense irregular connective tissue that lines the body wall and limbs and holds functional muscle units together |
fascia |
| a cord of dense regular connective tissue that attaches muscle to the periosteum of bone |
tendon |
| muscle cell |
muscle fiber |
| areolar and adipose connective tissue that separates muscle from skin |
subcutaneous layer |
| connective tissue elements extended as a broad, flat layer |
aponeurosis |
| a two-layer tube of fibrous connective tissue enclosing certain tendons |
tendon (synovial) sheath |
| synapse between a motor neuron and a muscle fiber |
neuromuscular junction |
| invaginations of the sarcolemma from the surface toward the center of the muscle fiber |
transverse tubules |
| myoblasts that persist in mature skeletal muscle |
satellite cells |
| plasma membrane of a muscle fiber |
sarcolemma |
| oxygen-binding protein found only in muscle fibers |
myoglobin |
| Ca+ storing tubular system similar to smooth endoplasmic retuculum |
sarcoplasmic reticulum |
| the contracting unit of a skeletal muscle fiber |
sacomere |
| middle area in the sarcomere where thick and thin filaments are found |
A band |
| area in the sarcomere where only thin filaments are present but thick filaments are not |
I band |
| separates the sacrcomeres from each other |
Z disc |
| area of only thick filaments |
H zone |
| cytoplasm of a muscle fiber |
sarcoplasm |
| composed of supporting proteins holding thick filaments together at the H zone |
M line |
| has fibers joined by intercalated discs |
cardiac muscle |
| thick and thin filaments are not arranged as orderly sarcomeres |
smooth muscle |
| uses satellite cells to repair |
skeletal muscle |
| striated |
skeletal & cardiac muscle |
| contraction begins slowly but lasts for long periods |
smooth muscle |
| has an extended contraction due to prolonged calcium delivery from both the sarcoplasmic reticulum and the interstitial fluid |
cardiac muscle |
| does not exhibit autorhythythmicity |
skeletal muscle |
| uses pericytes to repair damaged muscle fibers |
smooth muscle |
| uses troponin as a regulatory protein |
skeletal muscle & cardiac muscle |
| can be classified as single-unit or multiunit |
smooth muscle |
| can be autorhthmic |
smooth |
| uses calmodulin as a regulatory protein |
cardiac muscle & smooth muscle |
Ch.18 LTI-MA 509
